package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkSpaceService;
import com.sky.vo.*;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.apache.commons.lang3.StringUtils;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * ClassName: ReportServiceImpl
 * Package: com.sky.service.impl
 * Description:
 *
 * @Author 谢依雯
 * @Create 2024/12/12 15:06
 */
@Service
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkSpaceService workSpaceService;

    /**
     * 统计指定时间区间内的营业额数据
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO turnoverStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dates=dataCount(begin,end);

        //存放每天的营业额
        List<Double> turnoverList =new ArrayList<>();
        for (LocalDate date:dates){
            LocalDateTime beginTime=LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime=LocalDateTime.of(date, LocalTime.MAX);

            Map map=new HashMap<>();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double money=orderMapper.sumByMap(map);
            money=money ==null ? 0.0:money;
            turnoverList.add(money);
        }

        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dates, ","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }

    /**
     * 统计指定时间区间内的用户数据
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO userStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dates=dataCount(begin,end);

        List<Integer> totalUserList=new ArrayList<>();
        List<Integer> newUserList=new ArrayList<>();
        for(LocalDate date:dates){
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map=new HashMap<>();
            map.put("end",endTime);
            Integer total= userMapper.countByMap(map);
            totalUserList.add(total);

            map.put("begin",beginTime);
            Integer newUser=userMapper.countByMap(map);
            newUserList.add(newUser);

        }

        return UserReportVO.builder()
                .dateList(StringUtils.join(dates,","))
                .newUserList(StringUtils.join(newUserList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .build();
    }

    /**
     * 订单统计
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO ordersStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dates=dataCount(begin,end);
        //每日订单数
        List<Integer> orderCountList=new ArrayList<>();
        //每日有效订单数
        List<Integer> validOrderCountList=new ArrayList<>();

        for (LocalDate date:dates){
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("begin",beginTime);
            map.put("end",endTime);
            Integer orderCount=orderMapper.countByMap(map);

            map.put("status",Orders.COMPLETED);
            Integer validOrderCount=orderMapper.countByMap(map);
            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }
        //计算时间区间内的订单总数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();

        //计算时间区间内的有效订单数量
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        Double orderCompletionRate = 0.0;
        if(totalOrderCount != 0){
            //计算订单完成率
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dates,","))
                .orderCountList(StringUtils.join(orderCountList,","))
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 查询销量排名top10
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime=LocalDateTime.of(begin,LocalTime.MIN);
        LocalDateTime endTime=LocalDateTime.of(end,LocalTime.MAX);

        List<GoodsSalesDTO> list=orderMapper.getTop10(beginTime,endTime);
        List<String> names=list.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String name=StringUtils.join(names,",");

        List<Integer> numbers=list.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String number=StringUtils.join(numbers,",");

        return SalesTop10ReportVO.builder().nameList(name).numberList(number).build();
    }

    /**
     * 导出Excel报表接口
     * @param response
     */
    public void exportBusinessData(HttpServletResponse response) {
        //1. 查询数据库，获取营业数据---查询最近30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd=LocalDate.now().minusDays(1);

        BusinessDataVO businessDataVO = workSpaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));
        //2. 通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            XSSFWorkbook excel=new XSSFWorkbook(in);

            //填充时间数据
            XSSFSheet sheet=excel.getSheet("Sheet1");
            sheet.getRow(1).getCell(1).setCellValue("时间"+dateBegin+"至"+dateEnd);
            //获得第四行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            //获得第五行
            row=sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());


            for (int i=0;i<30;i++){
                LocalDate date=dateBegin.plusDays(i);

                BusinessDataVO businessData = workSpaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                //获得某一行
                row=sheet.getRow(7+i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //3. 通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out=response.getOutputStream();
            excel.write(out);


            out.close();
            excel.close();

        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }


    /**
     * 封装日期
     * @param begin
     * @param end
     * @return
     */
    public  List<LocalDate> dataCount(LocalDate begin, LocalDate end){
        List<LocalDate> dates=new ArrayList<>();

        dates.add(begin);
        while (!begin.equals(end)){
            begin=begin.plusDays(1);
            dates.add(begin);
        }
        return dates;
    }
}

